3. D
4. C
(DNA contains phosphorus)
From Pearson Biology book
The answer is the <span>Immune system</span>
Carbon
Carbon is a part of rocks and fossil fuels like oil, coal, and natural gas etc...
Answer:
Though the earth is 75% water, less than 1.2% is actually drinkable.
Explanation:
i think its amino acids but i am not sure sorry if it wrong